Mark you just use the bearings and one seal from the short block. You need to buy the other bearing. Assemble the engine seal and all. Slip the new bought bearing on the crank then install the aluminum bearing carrier. Center punch, drill and tap the case. You are correct that all bearings are roller. The ones you get in the engine and the one shielded one you need to buy. A 6201ZZ has two metal shields and a 6201VV has two rubber seals. These should be less than $5.00. You could also use one with a single seal but I would be afraid of dirt working in.